batgrbproduct analysis for trigger=766161
batgrbproduct Analysis for Trigger=766161
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Aug 4 23:15:52 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger766161/GCN5_download_cron
======================================================================
Trigger: 00766161 Segment: 000
BAT Trigger Time: 523516136 [s; MET]
Trigger Stop: 523516200 [s; MET]
UTC: 2017-08-04T05:08:36.526800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 230.833563887997 Dec: -19.5473832952482 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.29
Flight Position: [ source = BAT ]
RA: 230.833563887997 Dec: -19.5473832952482 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 230.780788458265 Dec: -19.5906859540611 [deg; J2000]
{ 15h 23m 07.4s , -19d 35' 26.5" }
+/- 4.52578662722494 [arcmin] (estimated 90% radius based on SNR)
+/- 2.3883821821085 [arcmin] (formal 1-sigma fit error)
SNR: 3.5189456463489
Angular difference between Flight and Ground position is 3.956316 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 71.7959999442101 +/- 18.9723404888213
Measured from: 2.40000009536743
to: 74.1960000395775 [s; relative to TRIGTIME]
T50: 39.5839999914169 +/- 23.4510611967743
Measured from: 14.9320001006126
to: 54.5160000920296 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 22.1480000019073
to: 23.1480000019073 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.712000012397766
to: 77.5120000243187 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.412242 0.233817 0.097716 -0.040840
0.067190 0.059853 0.049418 0.041742 [error]
Peak 0.018277 0.023328 0.002797 0.001953
0.007606 0.006850 0.005469 0.004608 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.27e-07 9.75e-08 4.99e-08 3.67e-08 2.92e-07 3.11e-07 erg/cm2
Error 3.37e-08 3.23e-08 3.43e-08 5.36e-08 8.93e-08 1.14e-07 erg/cm2
Peak flux Power-law 2.01e-01 1.27e-01 5.17e-02 2.86e-02 3.94e-01 4.08e-01 ph/cm2/s
Error 1.13e-01 5.80e-02 4.00e-02 4.69e-02 1.73e-01 1.80e-01 ph/cm2/s
Fluence Cutoff-PL 1.30e-07 9.93e-08 2.88e-08 3.24e-09 2.59e-07 2.64e-07 erg/cm2
Error 4.35e-08 5.10e-08 4.29e-08 5.19e-08 1.10e-07 1.35e-07 erg/cm2
Peak flux Cutoff-PL 1.74e-01 1.65e-01 2.97e-02 4.78e-04 3.69e-01 3.69e-01 ph/cm2/s
Error 1.33e-01 8.97e-02 4.57e-02 3.95e-02 1.76e-01 1.81e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.966 0.628 - - 3.15e-04 1.62e-04 76.640 57
CPL 1.000 0.000 50.0 0.0 1.51e-03 0.00e+00 89.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.294 0.910 - - 2.26e-03 1.38e-03 61.050 57
CPL -0.038 0.000 30.1 0.0 7.16e-02 0.00e+00 60.290 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 78.224 -0.712 77.512
T90 71.796 2.400 74.196
T50 39.584 14.932 54.516
Peak 1.000 22.148 23.148
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
230.7808 -19.5907 0.0547 32.0 -16.0 1.0458 3.5 TRIG_00766161
------------------------------------------
Foreground time interval of the image:
-0.712 73.501 (delta_t = 74.213 [sec])
Background time interval of the image:
-12.599 -0.712 (delta_t = 11.887 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.712 sec. to 77.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.96602 ( -0.56121 0.695378 )
Norm@50keV : 3.15186E-04 ( -0.000152398 0.000170827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.64 using 59 PHA bins.
# Reduced chi-squared = 1.344 for 57 degrees of freedom
# Null hypothesis probability = 4.242937e-02
Photon flux (15-150 keV) in 78.22 sec: 8.45701E-02 ( -0.0200428 0.0200672 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91685e-07 ( -8.47709e-08 9.37905e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.712 sec. to 77.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.51028E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.79 using 59 PHA bins.
# Reduced chi-squared = 1.603 for 56 degrees of freedom
# Null hypothesis probability = 2.789434e-03
Photon flux (15-150 keV) in 78.22 sec: 7.96434E-02 ( -0.0191989 0.0229646 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.52754e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.712 sec. to 77.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96155 ( -4.96155 -4.96155 )
beta : -3.45850 ( 3.4585 0.852539 )
Epeak [keV] : 18.2028 ( -18.2028 4.90656 )
Norm@50keV : 1131.93 ( -261.134 2.95514e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.71 using 59 PHA bins.
# Reduced chi-squared = 1.358 for 55 degrees of freedom
# Null hypothesis probability = 3.968862e-02
Photon flux (15-150 keV) in 78.22 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.82829 (-0.986784 1.28481)
R^2/D10^2 : 0.842948 (-0.842957 1.76423)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.18 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 57 degrees of freedom
# Null hypothesis probability = 4.567861e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.391e-07 8.014e-08
25- 50 8.328e-08 5.030e-08
50-150 2.851e-09 2.533e-09
15-150 2.253e-07 1.352e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2503 (-6.418 13.4982)
Norm : 1.32912 (-0.688897 1.54207)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.45 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 57 degrees of freedom
# Null hypothesis probability = 4.371825e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.322e-07 5.857e-08
25- 50 9.718e-08 4.844e-08
50-150 2.005e-08 1.777e-08
15-150 2.494e-07 1.113e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.42516 (-4.42377 1.28022)
R1^2/D10^2 : 1.18973 (-1.19021 12.491)
kT2 [keV] : 22.5986 (-22.565 -22.565)
R2^2/D10^2 : 5.54782E-04 (-0.000557662 1.26209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.84 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 55 degrees of freedom
# Null hypothesis probability = 4.585146e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.393e-07 8.080e-08
25- 50 8.629e-08 4.721e-08
50-150 8.443e-08 6.003e-08
15-150 3.100e-07 1.605e-07
Peak spectrum fit
Power-law model
Time interval is from 22.148 sec. to 23.148 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29395 ( -0.78954 1.03138 )
Norm@50keV : 2.26004E-03 ( -0.00139146 0.00136551 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.05 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.324652e-01
Photon flux (15-150 keV) in 1 sec: 0.393635 ( -0.173392 0.173493 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15724e-08 ( -1.06913e-08 1.17693e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 22.148 sec. to 23.148 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.78235E-02 ( )
Epeak [keV] : 30.1192 ( )
Norm@50keV : 7.16409E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.29 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 56 degrees of freedom
# Null hypothesis probability = 3.233031e-01
Photon flux (15-150 keV) in 1 sec: 0.368881 ( -0.174466 0.177919 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74886e-08 ( -8.13528e-09 1.39139e-08 ) ergs/cm2
Band function
Time interval is from 22.148 sec. to 23.148 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98084 ( -4.98084 -4.98084 )
beta : -2.50049 ( 2.50049 0.910159 )
Epeak [keV] : 20.6974 ( -20.6974 101.628 )
Norm@50keV : 1711.38 ( -739.094 1.16023e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.50 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.838705e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86445e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.08565 (-2.84695 4.21236)
R^2/D10^2 : 0.437601 (-0.4376 2.13608)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.26 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.586489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.214e-09 3.327e-09
25- 50 9.295e-09 6.055e-09
50-150 2.527e-09 2.358e-09
15-150 1.704e-08 1.118e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.9108 (-23.3637 149.025)
Norm : 2.69227 (-1.58165 4.34535)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.56 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.485895e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.067e-09 3.959e-09
25- 50 7.795e-09 4.915e-09
50-150 5.681e-09 4.732e-09
15-150 1.954e-08 1.373e-08
Double BB
R1^2/D10^2 : 1.51552E-05 (-1.5155e-05 -1.5155e-05)
kT2 [keV] : 7.78247 (-2.40271 4.20477)
R2^2/D10^2 : 0.497108 (-0.413629 1.80901)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.19 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.01 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.99 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 2.935668e-01
# Null hypothesis probability = 2.992000e-01
# Null hypothesis probability = 2.995641e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.553e-09 3.858e-09
25- 50 8.992e-09 6.485e-09
50-150 2.923e-09 2.546e-09
15-150 1.747e-08 1.257e-08
Plot creation:
Fri Aug 4 23:22:46 EDT 2017